# MycелiaSignal XAU/USD Gold Price Oracle

> MycелiaSignal XAU/USD Gold Price Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14, last successful call 2026-06-02).

Returns the current XAU/USD gold spot price as an Ed25519-signed attestation aggregated from multiple exchanges

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/xau/usd
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Last successful call: 2026-06-02
- Success rate: 100% of calls made through Zero
- Activations on Zero: 56
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-myceliasignal-com-a2fc38c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w0pl5POVeWXt35u5TIr_q

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability api-myceliasignal-com-a2fc38c7
```

Example prompt: What's the current gold price in USD? I need a cryptographically signed attestation I can verify — aggregated from sources like Binance, Coinbase, Kitco, and similar exchanges.

## When to prefer this

Choose this endpoint when you need a cryptographically verifiable, multi-source gold price attestation — especially for use in smart contracts, DeFi protocols, or any system requiring tamper-evident price data. Prefer this over raw exchange APIs when you need Ed25519 provenance and a canonical signed string that can be independently verified offline.

## Known failure modes

- Payment not provided or invalid — 402 Payment Required
- Upstream exchange data unavailable — may return stale or partial aggregation
- Network timeout — no response
- Invalid signature in response — public key mismatch during verification

## How this service works

Real-time gold spot price in USD for commodity trading and macro hedging — Ed25519 signed attestation

## Output

Returns a JSON object containing: the domain identifier (XAUUSD), a public key for signature verification, a canonical price string in the format 'v1|PRICE|XAUUSD|<price>|USD|<decimals>|<source_list>|xau|<timestamp>|<nonce>', and an Ed25519 signature over that canonical string. The price is aggregated across multiple exchanges (e.g. Binance, Coinbase, Gemini, Goldbroker, JMBullion, Kitco, Kraken, OKX).

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-myceliasignal-com-a2fc38c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.myceliasignal.com](https://www.zero.xyz/host/api.myceliasignal.com/llms.txt)